Curling iron



FIG. 1 is a top, front, right perspective view of a curling iron showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are for the purpose of illustrating portions of the curling iron that form no part of the claim. 

CLAIM The ornamental design for a curling iron, as shown and described. 